Added test root file
Modified .gitignore to exclude PDFsets directory
Fixed a typo missing a '-' in the root path
Added ::Create method and methods to return Steering Files and TGraphs
Added methods to return the x/y min/max, divide graphs, and convert a TH1 to a TGraphAE
Changed pci from reference to pointer, removed 'delete grid' from destructor
Removed const-ness from returning a PDFSteeringFile
Added plotting the PDF on top of the data. Currently NOT NORMALIZED/SCALED CORRECTLY